Support asymmetric JWK (#919)

test/SpecHelper.hs

@@ -13,7 +13,8 @@ import Data.List (lookup)
 import Text.Regex.TDFA ((=~))
 import qualified Data.ByteString.Char8 as BS
 import qualified Data.ByteString.Lazy as BL
-import System.Process (readProcess)
+import           System.Process (readProcess)
+import           Text.Heredoc
 
 import PostgREST.Config (AppConfig(..))
 
@@ -67,7 +68,7 @@ _baseCfg :: AppConfig
 _baseCfg =  -- Connection Settings
   AppConfig mempty "postgrest_test_anonymous" Nothing "test" "localhost" 3000
             -- Jwt settings
-            (Just $ encodeUtf8 "safe") False
+            (Just $ encodeUtf8 "reallyreallyreallyreallyverysafe") False
             -- Connection Modifiers
             10 Nothing (Just "test.switch_role")
             -- Debug Settings
@@ -89,9 +90,16 @@ testProxyCfg :: Text -> AppConfig
 testProxyCfg testDbConn = (testCfg testDbConn) { configProxyUri = Just "https://postgrest.com/openapi.json" }
 
 testCfgBinaryJWT :: Text -> AppConfig
-testCfgBinaryJWT testDbConn = (testCfg testDbConn) { configJwtSecret = Just secretBs }
-  where secretBs = B64.decodeLenient "h2CGB1FoBd51aQooCS2g+UmRgYQfTPQ6v3+9ALbaqM4="
+testCfgBinaryJWT testDbConn = (testCfg testDbConn) {
+    configJwtSecret = Just . B64.decodeLenient $
+      "cmVhbGx5cmVhbGx5cmVhbGx5cmVhbGx5dmVyeXNhZmU="
+  }
 
+testCfgAsymJWK :: Text -> AppConfig
+testCfgAsymJWK testDbConn = (testCfg testDbConn) {
+    configJwtSecret = Just $ encodeUtf8
+      [str|{"alg":"RS256","e":"AQAB","key_ops":["verify"],"kty":"RSA","n":"0etQ2Tg187jb04MWfpuogYGV75IFrQQBxQaGH75eq_FpbkyoLcEpRUEWSbECP2eeFya2yZ9vIO5ScD-lPmovePk4Aa4SzZ8jdjhmAbNykleRPCxMg0481kz6PQhnHRUv3nF5WP479CnObJKqTVdEagVL66oxnX9VhZG9IZA7k0Th5PfKQwrKGyUeTGczpOjaPqbxlunP73j9AfnAt4XCS8epa-n3WGz1j-wfpr_ys57Aq-zBCfqP67UYzNpeI1AoXsJhD9xSDOzvJgFRvc3vm2wjAW4LEMwi48rCplamOpZToIHEPIaPzpveYQwDnB1HFTR1ove9bpKJsHmi-e2uzQ","use":"sig"}|]
+  }
 
 setupDb :: Text -> IO ()
 setupDb dbConn = do